Shoe for piles made of concrete or other plastic material.



APPLICATION FILED AUG. 7, 1911.

Patented Jan. 27, 1914 IN l/E/V TOR WITNESSES:

DbUMDIA PIANOGRAPH co. WASHINGTON; D. c.

UNITED STATES PATEN @FIQ.

MORITZ KAI-IN, OF LONDON, ENGLAND.

SHOE FOR FILES MADE OF CONCRETE OR OTHER PLASTIC MATERIAL.

Specification of Letters Patent.

Patented Jan. 27, 1914.

To all whom it may concern:

Be it known that I, MORITZ KAHN, a citizen of the United States of America, residingat Caxton House, Westminster, London, England, have invented new and useful Improvements in Shoes for Piles made of Concrete or other Plastic Material, of which the following is a specification.

This invention relates to the construction of piles made of concrete or other plastic material and has for its object the provision of improved means on a preparatory tubular pile whereby a solid pointed shoe can be attached to the tubular pile to assist in driving the same and can then be detached and drawn up through the center of the pile so that concrete or other material can be fed down the center of the tubular pile to form a permanent pile.

My invention consists in the combination with a tubular pileof a solid pointed shoe detachably attached thereto by means of a screw thread or bayonet joint so as to form a part of the tubular pile during driving and subsequently be detached and drawn up through the tube leaving an unrestricted passage through the preparatory pile for the deposit of the concrete therein and the ultimate withdrawal of the tubular pile leaving the concrete pile in the ground.

In order that the invention may be the better understood, I will now proceed to describe the same in relation to the accompanying drawings, reference being had to the letters and figures marked thereon.

Like letters refer to like parts in the various figures.

Figure 1 shows the lower end of a preparatory pile with the solid pointed shoe detachably attached thereto by means of a screw. Fig. 2 is a sectional plan of the same on the line 22 of Fig. 1. Fig. 3 is a modified form of attachment of the shoe by means of segmental flanges as a bayonet joint. Fig. 4 is a sectional plan of the same on the line 4:& of Fig. 3. Fig. 5 is a section of a modified construction to that shown in Figs. 1 and 2 in which the cord is replaced by a gripping device carried by a spanner. Fig. 6 is a view of the tubular pile alone after the extraction of the detachable shoe. Fig. 7 shows a concrete pile in place after the withdrawal of the tubular pile.

In Figs 1 and 2, at the lower end of the preparatory pile a is an internal screwed portion 6 into which the solid pointed shoe 0 is screwed. To the shoe 0 is attached a cord or chain (Z by which the shoe 0 can be drawn up through the interior of the tube a. After the pile has been driven down to the proper dept-h a tubular spanner z is passed down upon the cord or chain (Z so as to engage with a square neck 6 projecting upward from the interior of the shoe 0. By means of this spanner the shoe 0 is unscrewed inwardly, so that when the screw-threads are disengaged the shoe 0 can be drawn upwardly through the tube a by means of the cord or chain d.

In Figs. 3 and L the shoe 0 is provided with segmental flanges f which are adapted to engage in segmental recesses 9 arranged on the internal periphery of the tube a. When the shoe 0 is to be withdrawn in this case the tubular spanner is engaged upon the neck 6 and the shoe is turned bodily until the segmental flanges f coincide with the segmental annular spaces h,- the length of the flanges f being such as to pass easily in an upward direction through the said spaces It. The shoe 0 can now be raised through the tube by means of the cord or chain d.

Instead of using a chain or cord it is obvious that I may use any equivalent device such as a rod or tube by which the detached shoe can be drawn up through the tubular path. As an example I show in Fig. 5 the spanner engaging the square stem 70 of the shoe the spanner being provided with spring pressed fingers m pivoted thereto and having turned over ends as claws adapted to engage under a shoulder a on the stem so as to lift the shoe upward when detached. The upper end 0 of the stem is made conical so that the claws can be separated to enable engagement between the claws and the stem to be effected. It will thus be seen that while the solid shoe can be used on the end of the preparatory pile in order to facilitate the passage of the pile through the ground it can readily be detached from the tubular pile and be drawn to the surface and thus be used over and over again as owing to its solid construction the effort of driving does not destroy its integrity and efficiency as a driving point in any way.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. A preparatory pile for the construction of piles of concrete or other plastic material consisting of a tubular pile, a laterally extending helical rib at the interior of the lower end thereof, the diameter of the bottom of which is less than the diameter of the tube, in combination with a shoe having a conical lower end and a laterally extending rib adapted to engage the rib of the tubular pile, means for engaging the shoe to rotate and disengage the same from the tube, and for Withdrawing said shoe from the tube, substantially as described.

2. A preparatory pile for the construction of piles of concrete or other plastic material F consisting of a tubular pile having an internal helical ribbed portion at its lower end,

in combination With a shoe having an external helical ribbed portion adapted to engage the internal ribbed portion of the tubular pile, a withdrawing head on the shoe with a nose and an engaging means to turn and lift said shoe, constructed to automatically be expanded by said nose so as to engage said shoe, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

H. D. JAuEsoN, B. WILLIAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

